Add a text entry box to the simple-chatbot example

examples/simple-chatbot/client/javascript/index.html

@@ -30,6 +30,13 @@
           <select id="device-selector"></select>
           <button id="mic-toggle-btn">Unmute Mic</button>
         </div>
+        <div class="text-input-container">
+          <input
+            type="text"
+            id="text-input"
+            placeholder="Type your message..." />
+          <button id="send-text-btn" disabled>Send</button>
+        </div>
       </div>
 
       <div class="debug-panel">